JPS60501491A - Soil purification method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Soil purification method Technical field of the invention In a first aspect, the present invention removes halogenated organic contaminants from soil that are susceptible to biological attack. Halogens consisting of partial or complete in-situ conversion to dehalogenated compounds This invention relates to a new and improved method for increasing the biodegradability of carbonized organic pollutants. Ma In a third aspect, the present invention provides for first treating soil contaminated with polyhalogenated organic compounds. The compound is hydrolyzed to increase the biodegradability of the compound, and then the seven hydrolyzed species are A new method for purifying reaction products by biologically decomposing them. and an improved method.

Many polyhalogenated organic compounds are clearly harmful to the surrounding environment and public health. It is. Many of these compounds are potent in plants and animals, and are physiologically active and It is cancerous. Polyhalogenated organic compounds also bioaccumulate ( bioaccumulate). As a seventh example, plants grown in contaminated Humans who eat or drink meat or milk from animals raised on food may suffer harm to humans as a result. Ingestion of the compound that gives .

In addition, the above-mentioned compounds can be leached from soil damage where they are present, and can be found in streams, rivers, lakes, etc. or similar environments, where the compounds likewise pose considerable hazards. Tabak (Tabak) et al.'s "BiOdegradability 5 studies" WithOrganic Pr1ority Po1lutant C! omp ounds J Journal WPC! F1 Volume 53, Nα/θ (/9.7/year/ Please refer to pages 7503-151g of θ Month).

An example of a polyhalogenated compound that possesses the dangerous properties mentioned above is polychlorinated biphenyls. Nils and tyoxins, hexachlorobenzene and polychlorinated phenols. other highly chlorinated aromatics such as carbon tetrachloride and trichlorethylene Polyhalogenated aliphatics.

In industry, polyhalogenated organic compounds are used in thermal media, heat transfer fluids, and fuel materials. It is widely used as a compound, and some of the compounds are stable and insoluble in water. It is also used for other purposes. These potentially dangerous polyhalogenated compounds is the improper disposal of prohibited chemicals, used chemicals, and chemicals in use. Treatment: Accidental spillage: A large number of children are introduced into the soil due to accidents during transportation, etc. It has been and continues to be used today.

Due to the hazardous nature of the above-mentioned compounds, the presence of polyhalogenated compounds in the soil In particular, the stability and insolubility of the compound means that it may persist indefinitely in a dangerous form. This is quite a cause for concern.

Technical background Several methods have been proposed for treating polyhalogenated organic compounds. Polychloride For biphenyls (FCBS), the U.S. Environmental Protection Agency (UnitecL 5ta) tes Environmental Fretθction Agency) Therefore, the seven methods approved are incineration. If the compound is present as a soil contaminant this solution is not feasible due to the large volume of material containing contaminants. It becomes as expensive as possible. Incineration also removes corrosive and toxic substances from the incinerator effluent. This includes the need for complex and expensive equipment to remove ash and the disposal of toxic ash. [Pytlθwski et al. /91] which gives rise to many other problems. ．． U.S. Patent No. ’1,337, issued June 2, 2017. ．． 3tza issue ``Halogen Please refer to ``Agents and Decomposition Methods for Decomposing Chemical Organic Compounds''].

Dumping and moving contaminated soil to safe landfills is also harmful due to polyhalogenation. Other techniques that can be used to dispose of compounds. This technique is also economically viable. It's not useful. In this case as well, the polyhalokenated compound is not decomposed and ζ remains. and the integrity of buried land remains intact and continues to present a potential threat. .

Ultraviolet decomposition, hydrothermal decomposition and radiative decomposition of polyhalogenated hydrocarbons have also been proposed. 0 The techniques are ineffective and/or economically unviable even in the absence of soil. It is of no use and the decomposition products are not significantly less dangerous than the original material. U.S. Patent issued on July 3, 2013 by Hatano et al. , No. 3j197g ``Disposal method of polychlorinated biphenyls''].

In addition, a method for purifying an environment contaminated with polyhalogenated organic substances by attacking microorganisms. was also studied [Tabak et al. and Shiaris and Seira, supra. (Saylor)'s “BioTransformation on PCB-Paper” Natural Assembly on Fresh Water φMicro Lugenaismus (BiotransfOrmatiOn of PCB by Natural Assemblies OfFreshwater Micr oorganisms month gnvir, Sci+Tech,, Volume 16, Naotsu, / Teniko year 367-36? Please refer to page].

This solution consists of PCB hardware/and PCB/with chlorine content of 27% and 32%, respectively. Chlorinated compounds with a relatively low degree of chlorine substitution such as No. 232 are effective. but , this technique produces pCB/koku with a higher degree of chlorine substitution. 2 (g, 2% cl), P CB/, 2’l (541% (:J-) or PCB/IAO (4θ%l0f ) is not useful for chlorinated compounds such as All of these PCBs are still in large quantities exists in

The microbial attack described above is not an effective technique for degrading highly halogenated organics. Written by Saha Barscharen [Hunt Hook on Environmental Data] ◆On e Organic Zen Chemicals (■θrsChuθrθn1Handboo k of EnvironmentIData on OrganicChe micals) J Pan e Nordstrand Reinhold Kanpa=-(V an No5trand R51nhold Company) (= Knee 236 pages 1, 237 pages, 36.2 pages, 343 pages, S /1 page, 6θg page, and bor page.

The following is reported regarding the biodegradability (ring disintegration) of halogenated organic substances in seeds. (Culture solution containing 2θ□ lny/l at 30°C): Hexachlorobenzene ts o R 70% pentachlorophenol / , 20 hours 1kl tear%i, 2. <t-t') Chlorobenzene 7.2θ 72% in time, Darsik oral phenol 961fiHfsj te/00% It also decomposes polyhalogenated organic compounds, thereby rendering them relatively harmless. Several chemical methods have been proposed for this purpose. The above method involves chlorine decomposition, Catalytic hydrogenation-dechlorination, molten salt reactions, alkali metal reduction in “solvated sulfur” solvents Decomposition with sodium metal complex compounds and alkali metal alcoholades or alkaline Involves reaction with potassium component/alcohol mixture. These techniques were developed by Hatano et al. Trewsky's above-mentioned patent; Howard et al., July 2, 19g1 U.S. Patent No. 11 issued on the 7th. J, No. 220.27, “Chlorinated Aromatic Asphyxia Compounds” "Chemical detoxification method", published by BraWn et al./9g March 3rd, Ri-H. No. 4.37’1’77 “Polychlorinated Bif from Transformer Oil” "Method for Removal of Phenyls" and Pitrewski et al.'s Proceedings on the Synox Annual Research Symposium on the Q Treatment On Hazardous Us Again (Proceeclings of the 5ixth Annual Research Symposium on th e Treatment of Hazardous Waste (79gθ) March) The Reaction on PCB'θ with Sode on pages 7.2-76 Polyethylene glycols (The Reac) tionof PCB’e With Sodium, Oxygen an dPolyethyleneG17CO1[]).

The chemical techniques proposed so far to render polyhalogenated organics harmless are The above techniques can be carried out even if the mentioned compounds are not present in the form of soil contaminants. It has a number of significant drawbacks and limitations that make it unusable. These drawbacks and limitations 1. Requires special chemicals, high temperatures and pressures: such as metals, metallic sodium, etc. Problems arising when processing substances that are highly reactive and require large amounts of energy It includes that. Because of these requirements and limitations, the The chemical manipulation of highly chlorinated organic compounds that have been It is impossible to implement in an environment that exists as

A simple report (OMEN, 79g, 2 years/θ month q days) Unspecified chlorine in soil samples under laboratory conditions using tylene gluconate complex compounds It has been described that it has been successfully used to reduce the concentration of PCBs in the content.

However, if the experiment is conducted using relatively low salts such as PCB /, 2u / or /23 There are also drugs that contain compounds with a degree of elementary substitution and that are clearly made from metallic sodium. Apart from the fact that That is important.

In contrast, I use This paper describes high halogen production under field conditions by using the novel method described here. Concentration of genified soil contaminants (PCB/, 21Ig) as high as 2/:1/7 days Achieved solving speed.

Furthermore, the method does not have the drawbacks of the previously proposed techniques mentioned in the previous section, and is relatively It can be carried out at ambient temperature and pressure using inexpensive chemicals and requires no energy. It does not require the treatment of highly reactive substances and does not involve the treatment of highly reactive substances. Also polyhalogen My #'r current technique for decomposing organic matter is to remove the compounds in the soil in a reasonable amount of time. has the unique advantage of being able to be used for at least partial dehalogenation. profit The resulting dehalogenated product is typically more water soluble than the original compound and is also more soluble in soil. whereas they can be more easily transformed by microorganisms into relatively harmless compounds. Even though the original highly halogenated insoluble compound could be attacked by microorganisms, microorganisms can only be attacked under limited conditions (versus Disclosure of the Invention My novel method for converting polyhalogenated organic soil contaminants into relatively harmless compounds The method involves placing a chemical mixture of alkaline components and sulfoxide catalysts in close contact with contaminated soil. (a combination of the above ingredients is a mixture of those ingredients separately and even sequentially) (herein referred to as a chemical mixture).

The chemical mixture extracts polyhalogens from soil particles that have adsorbed polyhalogenated contaminants. The pollutants are then dehalogenated.

The application window of the chemical mixture to the contaminated soil and the mixing of the mixture with the soil are carried out on site. However, it does not necessarily have to be done on-site.

The ability to be carried out in situ is clearly an important unique advantage of the present invention.

The exact seven or more dehalogenation pathways that occur depend on the halogens present in the soil. chlorogenated organic contaminants and especially the alkaline components used to decompose the contaminants. Much depends on nature. /As salt, trichlorobenzene and potassium hydroxide/ The reaction with benzyl alcohol/dimethyl sulfoxide (DMSO) mixture is as follows: Shown by a series of reaction equations: φ-Cil(,OK+φcJ,,--→c12φocn2φ10Kc,A(9) C12φOCH2φ10H20--→C12φOH10H20H, and C1□φ OH+KOH-+CJ-2φOK+H,0 dichlorophenol and its potassium The mu salt is much more biodegradable than the original trichlorobenzene.

After dehalogenation of the contaminant, it becomes a lower halogen saponified product and therefore more voluminous. Easily metabolized reaction products (see data from Verschueren, supra) ) is decomposed into relatively harmless compounds by the action of microorganisms.

Naturally occurring mixed populations of microorganisms can be used for purposes of the present invention. of the present invention In the above techniques for applying the principles, the chemically treated soil is Biodegradation of dehalogenated contaminants by microorganisms that migrate to the area allows the contaminants to be tolerated. Simply leave it alone until it is reduced to a level. The soil is naturally Until the chemical dehalogenation reaction continues for a long period of time (probably several years). This is an advantage of this technique. Therefore, this solution performs a very large amount of dehalogenation. and, as a result, provide an opportunity for soil remediation to very low levels. It is something that However, this requires a long period of time.

A second technique for applying the principles of the present invention involves chemical dehalogenation of contaminated soil. Following the conversion treatment, inoculation with suitable species of heterotropic microorganisms such as supranuclear gH Sudoku (See Charlize et al., cited above). row of suitable microorganisms is a Pseudomonas species (Verschueren Handbook mentioned above) Please refer to ).

Microorganisms such as Pseudomonas spp. It grows best in soils with a balanced supply of nitrogen, phosphorus and carbon. breed. However, due to the alkaline content, the addition of chemical mixtures to contaminated soil is Usually has a pH higher than the optimum pH. Therefore, chemical treatment of contaminated soil After the dehalogenation (dehalogenation) is completed, the products produced by chemical soil treatment are decomposed. In order to reduce the pH of the soil before inoculating the selected microorganisms into the soil. That is usually advantageous.

Typically, this involves spraying the treatment area with a dilute solution of acid and then e.g. distributing the acid evenly. It is most economically achievable to rake or till the soil in order to .

Common acids are sulfuric acid and acetic acid.

Hydrochloric acid can also be used. However, the reaction between hydrochloric acid and the alkaline component of the chemical mixture6 More H4 potassium chloride salts may inhibit microbial growth to some extent.

Other techniques for lowering soil pH, such as using acidic fertilizers, are available in the literature. are known and may optionally be used if economically advantageous.

Microorganisms from contaminated soil can be used before inoculating the contaminated soil with microorganisms. Adjusting the balance of nutrients nitrogen, phosphorus and carbon has also been found to be advantageous. Ta. This ratio also reflects the dehalogenated organic compounds present in the treated soil, as well as the pH. clearly affects the ability of microorganisms to biodegrade.

Commercially available chemical fertilizers can be mixed into the treated soil for this purpose. solid Chemical or liquid fertilizers can be used; the choice of chemical fertilizer usually depends on the circumstances. This is done accordingly due to economic factors.

This second purification technique has the advantage of being faster than the seventh purification technique (probably the first purification technique). The second purification technique takes days or weeks, whereas the method takes several years). On the other hand, Due to the cost of culturing microorganisms to inoculate contaminated soil, Neutralization (lowering of pH) of the soil necessary to provide an environment may cause the dehalogenation reaction to be incomplete. Purification may not be complete in order to make it whole.

A third option for soil remediation according to the principles of the invention is to first pre-clean the contaminated area. oxidation followed by the second chemical microbial treatment procedure described above ( chemical treatment and then chemical treatment of Pseudomonas species or other microorganisms. (introduce a new area).

This third method of selection is based on raw materials such as dichlorophenol and hexachlorobenzene. Useful where a mixture of degradable and non-biodegradable contaminants is present. Preparatory student The decomposition process removes all or part of the environmentally biodegradable contaminants from the contaminated soil. the amount of chemical mixture that can be used to and costs can be reduced.

In most cases, method #1 of the three soil purification methods mentioned above is the fastest in the purification process. For the most part this is why it has been found to be most advantageous.

Chemical treatment of the novel method of the present invention for remediating soil poisoned with polyhalogenated organics In the chemical process, chemical mixtures are mixed with at least alkali components per mole of contaminants. mix with the contaminated soil in the amount given.

Typically, the reaction rate between the contaminant and the alkaline component of the drug mixture is -Limensions applied according to the economics of the individual situation, which determines the upper limit of the application rate of the ingredients. A more sieve concentration of the drug mixture can be used since it is a function of the rate of the seven components. .

The above-mentioned alkali components useful in the method of the invention include alkali metal hydroxides, heptahydric alcohols, mixtures of alcohols and covalent alcohols and the above hydroxides and alkoxides. be.

A preferred hydroxide for use alone or in a mixture with an alcohol is potassium hydroxide. It is mu. Two types of alkali metal hydroxides that are easily available (quantitatively) and inexpensive ( The other is sodium hydroxide), but potassium hydroxide has a much faster reaction rate. is obtained. However, sodium hydroxide can also be used, as well as hydroxide Lithium chloride, cesium hydroxide and rubidium hydroxide can also be used. What is that? The latter three hydroxides are currently too expensive in practice.

If a hydroxide/alcohol mixture is selected as the alkaline component, the heptahydric alcohol Both alcohol and covalent alcohols can be used.

Among the heptahydric alcohols, benzyl alcohol is preferred. This is benzilua Lukol is a very potent drug for the purposes of this invention, and also has a relatively low molecular weight. This is because. Other aromatic alcohols can also be used, as well as Higher aliphatic alcohols such as alcohol can also be used; Benzyl alcohol has no effect on the throat. Lower aliphatic alcohols - %1 rice Chill alcohol has a very poor effect.

(/the law of nature ) Covalent alcohols that can be used include ethylene glycol, propylene glycol and Polyethylene glycols, especially polyethylene glycols with a molecular weight of -〇　~tθ0 Includes recalls.

Alkoxides can be used as a class for purposes of this invention. Al Potassium tert-butoxide and potassium tert-butoxide Grade benoxides are preferred. However, these compounds have the disadvantage of being expensive. have points.

In general, sulfoxides are useful as catalysts in the novel process disclosed herein. Ru. However, the larger the molecular weight of sulfoxides, the more Also, the thicker the molecular weight, the higher the melting point of sulfo and oxides. and as a result freeze faster than lower molecular weight sulfoxides (in practice). becomes impossible).

Dimethyl sulfoxide (DMSCI) is a suitable sulfoxide catalyst. Sulho Ran (tetramethylene sulfone) is an example of another sulfoxide that can be used; Sulfolane has a higher melting point than DMSO [relative to sulfolane core °C (gθ, 6T)] DMSO/gj℃(As, 3'F)), sulfofuran is catalytically The number of days it exists in the active non-solid state is less than DMS O per 7 years.

The proportion of catalyst/alkaline components in the chemical mixture is not critical. this is a lot of sulfoxide is present in the reaction mixture, and therefore the sulfoxide is a drug contaminant. suppressing the necessary contact between the alkaline component of the compound and the adsorbed polyhalogenated contaminants. The upper limit for the amount of sulfoxide present is not yet known; This is because the activity of the alkaline component increases in proportion to the amount of catalyst present.

In most cases, an alkaline component/sulfoxide catalyst ratio in the range of l/q to 'I// is effective. and for the best balance of cost (all proportions mentioned herein). and percentages are by weight).

The choice of drug for a particular application is determined by a variety of factors. Alkoxy Hydroxide, hydroxide/glycol, and hydroxide W-alcohol mixtures are substantially less than hydroxide. Stronger base, but more expensive. Alkoxide/sulfoxide mixture substances tend to be much more viscous than standard hydroxide/sulfoxide mixtures and are May reduce the rate of extraction of organic contaminants from soil (dehalogenation of contaminants) (No attachment or detachment will occur).

On the other hand, stronger bases can react faster with most halogenated organics and also react with water more quickly. Organic substances that are not affected by oxides can be dehalogenated. For example, PCB / For #’1 (PCB with average sti wt% chlorine), KOH/PEG The O/DMsO mixture has a 5θ% xoH/DMSO mixture in pure solution with a can react 20 times faster (PEG resin 00 is a polyester with a molecular weight of q-OO). ethylene glycol). However, when applied to soil, hydroxide/sulfonate The viscosity of the oxide mixture is lower than that of the KOH/PEG/DMSO mixture, and The cost of hydroxide/sulfoxide mixture 1 is KOH/P E G/DM S Higher volumes of hydroxide/sulfonate at a given cost of application due to lower O mixtures Adding an equal cost amount of KOH/DMSO solution for the availability of oxide Often a KOH/PRG/DMSO solution can work better. follow Therefore, the selection of the most cost-effective chemical mixture is a function of the relative rates of extraction and reaction. Depends on fit.

The soil and the chemical mixture (or solution) are intimately mixed together and the chemical solution and halogenated Contact between organic matter should be maximized. Mixing is done using a funnel tiller, harrow or This can be done on-site using similar equipment.

Also mix the soil at least 7 times to promote desorption of organic contaminants into the reaction mixture. That's a great thing.

The chemical solution and the halogenated contaminants in the amount of the chemical solution containing certain halogenated organic Depending on the rate of reaction of the substance, soil temperature and degree of reaction required, it may take several days, weeks or more. React for at least 1 hour. In some cases, the soil may be treated with plastic or It is advisable to cover the chemical solution with a rain screen of similar material to avoid dilution of the chemical solution by rainwater. stomach.

Cohen's U.S. Patent No. 3, issued in 1999. 'Ig199/No. ``Preparation method of chlorinated hydroxy compounds'' Hydrolyzes chlorinated compounds by reacting with alkali metal hydroxides in the presence of sulfoxides Discloses a reaction similar to ash that can be used in the novel purification method described above in terms of understanding.

However, the patentee claims that the above-mentioned reaction is possible from hexachlorobenzene to pentachlorophenol. It merely discloses that it can be used to make a roll. More Kohe The reaction must be carried out at elevated temperatures, which are not used in the process of the invention. and, of course, the reagents disclosed in that patent are disclosed herein. Soil remediation operations that require first desorption of soil particles and then desorption of the desorbed contaminants There is no suggestion that it can be used to dehalogenate dyed fabrics.

Remediation of highly halogenated pollutant-containing soils involves the removal of organic soil pollutants that are adsorbed onto the surface. Organic halides in liquids, such as those carried out in Cohen's method, are not available for reaction. This is very different from dehalogenation of genides.

Therefore, soil chemicals can desorb halogenated organic matter from the soil and also desorb the desorbed organic pollutants. It must be able to dehalogenate dyed materials. This factor is due to liquid Determining the effectiveness of soil chemicals by testing their performance in solution This makes it impossible. For example, KOH/PEG 1ooo chemicals are used at high temperatures. Works well when applied as a liquid. However, treating contaminated soil Not useful at all. Different from this (7g) Therefore, its use in liquids under environmental conditions (this is a chemical with relatively poor action) Thixon/DMso drugs have the same cost per 7 days as KOH/PEG da0theta drugs, 2/,,1. *Reduces pollutant concentration in soil with remarkable reaction speed.

Purpose of the invention From the foregoing, the reader will understand that the seven important and primary objectives of the present invention are to eliminate highly halogenated organic contaminants. It will be clear that there is a new and improved method for removing soil from the soil.

An equally important and primary objective of the present invention is the treatment of highly halogenated organic compounds in soil. to reduce the halogen content of the compound in situ, thereby making the compound more biodegradable. The aim is to provide a novel method for

Other more particular and nevertheless important objects of the invention are those mentioned in the foregoing objects. Here is to provide a method like: Effective within a reasonable period of time; Can be carried out in the soil on site; cost effective; Can be carried out at ambient temperatures and pressures; Does not involve high energy; does not require high energy.

Other important objects and additional features and advantages of the invention are set forth in the foregoing description and appended claims. The scope and examples below will make it clear to the reader. The examples described below are illustrative of the present invention. They are intended for clarity only and are not intended to limit the scope of the invention as claimed. It is not intended to be illustrated.

Preferred embodiments of the invention Example 1 PCB /: 17g 5 gallons of test subdivision of r 09G KOH, next 7 gallons of DMSO was added.

These chemicals were then mixed with the soil in this area using a rototiller. For testing The small area was covered with clear plastic to avoid dilution of the chemicals by rainwater.

Laboratory analysis of the contaminated soil gave the following results: Chemical additives /, 2S One hour after addition, 5 pieces 70 days after addition /S After addition/day 3.2 In total, the concentration of PCBs in contaminated soil decreased by qq, qg, and Average contaminant level over time/7. ! There was a decrease in PCB concentration by r%/day. .

Soil containing PCB/, 24t, 2/Oppm? I in SO water Potassium oxide 0. 'lAm1 and DMSOO, 7rsl. 77 at room temperature The analysis values after 1 day showed that the PCB level in the soil decreased by q o, s - + s, o %. It showed that there is.

Example 1 S feet containing PCBs with a chlorine content of approximately ytra) ) 5 gallons of soil from the test plot of (j'X j'X /') H,j gallons of benzyl alcohol and 10 gallons of DMSO as described in Example I. Mixed like this. Laboratory analysis of contaminated soil yielded the following results: Before adding chemicals ll/ One hour after addition Deg 10 days after addition Here 79 days after addition /,,2 In this test, the reduction of PCBs in soil was 9g, 9%, and the PCB content The average 7-day decline rate is kot, 2 pentac, lolophenol/2.7.7pp Soil contaminated with m is treated with KOH solution (jOlKOH in water), ? CH and DMSO/ , 2chi. Analysis values after 5 days showed that pentachlorophenol was detected in the sample. (Detection limit/Oppm) 0 cases■ 50% KOH100pJ, %PEG4100 100pJ, and DMSOg A chemical mixture containing 00 μm was added to qg of soil and oil containing 7.2kll of PCBs. 7 g. The resulting mixture was covered, kept under ambient conditions for g days, and analyzed. did. PCB concentration in soil is from 24t Oppm/g! i ppm , the overall decrease rate was 2.9%, and the average decrease rate per 7 days was 31.2%. It was Chi.

In each case, the decomposition products are not very highly halogenated, so Second, the product is then more susceptible to biodegradation than the original compound. This is Bhascha Singh 1 Those parts of a handbook minute data (as this information is not very valuable) To confirm the exact nature of the decomposition products produced in the procedure summarized in Example 1-V. ).

The present invention is primarily disclosed with respect to the highly chlorinated organic compounds mentioned above. this is me It is not intended to limit the scope of protection to which individuals may be entitled. this is a book The invention also applies to soils contaminated with other highly halogenated toxic substances or other undesirable organic matter. This is because it can be used to remove soil. Seven examples of the substances mentioned above are polybrominated biphenyls. PBBS). The compound is absorbed by the plant and then It is known that it is ingested by animals and enters the food chain by feeding them.

Furthermore, the present invention may have features other than those described above without departing from its spirit or essential characteristics. It can be implemented in other forms. The embodiments of the invention described above are therefore as described. All such aspects are considered and are not limiting. of the present invention Instead of denoting the scope by the appended claims, It is intended that the present invention encompass all changes within the range.

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Claims (1)

[Claims] l A less chlorinated compound of highly halogenated organic soil contaminants; This allows for the conversion of compounds into more soluble and easily metabolized compounds by microorganisms. to at least partially dehalogenate soil contaminated with highly halogenated organic contaminants. the alkaline component and the sulfoxide catalyst. The alkali component contains an alkali metal hydroxide, an alkali metal hydroxide and an alkali component. Highly halogenated mixtures of alcohols or alkoxides Method of converting machine contaminants. U. Claim 1, wherein the alkaline component of the chemical mixture is potassium hydroxide. the method of. 3 The alkaline component of the chemical mixture is a combination of alkali metal hydroxide and benzyl alcohol. The method according to claim 1, which is a mixture. The method according to claim 1, wherein the alkali metal hydroxide is potassium hydroxide. . S The alkaline component of the chemical mixture is alkali metal hydroxide and polyethylene glycol. 8. The method according to claim 7, wherein the method is a mixture of Mu Alkali metal hydroxide is potassium hydroxide, polyethylene glycol is The method according to claim S, having a molecular weight in the range of θθ to 6θ0. H) The alkali metal component of the chemical mixture is an alkoxide, and the alkoxide is Claim 1: Lithium tert-butoxide or potassium tert-butoxide The method described in section. Claims that the sulfoxide of the catalyst in the chemical mixture is dimethyl sulfoxide. The method described in paragraph 1. The alkaline component/catalyst ratio in the chemical mixture is i/lrt~q// in parts by weight. A method according to claim 1. /a per mole of polyhalogenated organic compound in the soil contaminated with the chemical mixture Claimed to be mixed with contaminated soil in an amount to provide at least one mole of the metal component. The method described in paragraph 1. ll By contaminating the soil and biodegrading polyhalogenated organic compounds. In the soil purification method, the soil is at least partially freed from the organic compounds. mixed with an effective amount of a chemical mixture capable of dehalogenating, thereby The biodegradability of organic compounds is increased and the mixture contains alkaline components and sulfoxide catalysts. the alkaline component is an alkali metal hydroxide, an alkali metal hydroxide and a mixture of alcohol or alkoxide. . /U Claim 11, wherein the alkaline component of the chemical mixture is potassium hydroxide. Soil purification method. /3 The alkali component of the chemical mixture is the alkali metal hydroxide tobenzyl alcohol. The soil purification method according to claim 1, which is a mixture. Mu: The soil according to claim 1, wherein the alkali metal hydroxide is potassium hydroxide. Soil purification method. /3 The alkaline components of the chemical mixture are alkali metal hydroxide and polyethylene glyco The soil purification method according to claim 1, which is a mixture of soil. /l-alkali metal hydroxide is potassium hydroxide, polyethylene glycol has a molecular weight in the range of 200 to A00. Method. /2 The alkali metal component of the chemical mixture is an alkoxide, and the alkoxide is potassium tertiary butoxide or potassium tertiary bentoxide The soil purification method described in box 1/. 7g Claims that the sulfoxide catalyst of the chemical mixture is dimethyl sulfoxide The soil purification method described in Section 1/. /q, the soil according to claim 1/1, in which the chemical mixture is applied to contaminated soil on site; Soil purification method. , 2O, at least partially dehalogenated after mixing the chemical mixture and the soil. At least seven types of microorganisms that are effective in biodegrading organic compounds are introduced into the soil. The soil purification method according to claim 1, characterized by the step of inoculating the soil. xi After mixing the chemical mixture and contaminated soil, dehalogenate the pH of the soil. promotes the ability of microorganisms inoculated into contaminated soil to degrade organic pollutants. The soil according to claim 10, which includes the step of reducing the soil to a level effective for Purification method. After mixing the soil with the 2-unit chemical mixture, the nutrients carbon:nitrogen in the contaminated soil A ratio of phosphorus was mixed into contaminated soil to degrade halogenated organic pollutants. Claim No. 3 includes the step of adjusting the ratio to be effective to promote the performance of the microorganism. The soil purification method described in Section 20. , 2.2 Claim 20, wherein the microorganism inoculated into the soil is Pseudomonas species. Soil purification method described. 2'A　4h Make sure that the alkaline component/catalyst ratio in the chemical mixture is //lI～ri// The soil purification method described in item 1/of the scope of the request. λ, the chemical mixture should be at least 100% Claim 1: mixing with the soil to be purified in an amount to provide alkali metal components / Soil purification method described in section. , 2m The reaction product of hydrolysis of the pollutants in the soil treated with the reaction mixture is then Decomposed by naturally occurring microorganisms transferred to the treated area Soil purification method. Rich: The soil contains biodegradable pollutants and non-biodegradable pollutants, and also contains chemical mixtures. Before mixing the soil, add an effective amount of biodegradable contaminants to the soil. The soil purification method according to claim 1, wherein at least seven types of microorganisms are inoculated. (1)